Custom Taxonomies – Add Listing

I have singular Categories – No SubCategories. These are my Main Locations

I created a Taxonomy Key – named ‘Area’ and populated that with the same named Categories and added Subcategories. These are my Location Areas

Advanced search is working fine, select a main Category and a Subcategory will appear in Area.

However ❓

Is it possible to link Step 2 Listing Category: selection to my new Taxonomy.

Ive added a new Custom Field – Listing Setup, which appears fine in 4 Listing Attributes but I can’t get it to link with Step 2, is there some trick I’m missing ?